Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39929cb1f2f2adb…

MALICIOUS

PDF

85.4 KB Created: 2021-03-05 02:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: df3b9a87e5d5d3087bddacc7eb28e228 SHA-1: 0dbba23b4ee97e21fa9212e357c1e3af73add447 SHA-256: c39929cb1f2f2adbeec0a52fa06005836570b38fea71112e40eeda66f40f5275
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though heavily obfuscated, suggests a lure related to 'administracion de medicamentos por via inhalatoria definicion'. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=administracion+de+medicamentos+por+via+inhalatoria+definicion PDF link annotation
    • http://nomokesus.sportsontheweb.net/how_computers_work_book_reddit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486353/normal_5ffac6abc4ff0.pdfIn PDF document text
    • http://tryraisins.pro/38824200515dgtcn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_5fe6ed7cc5f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_602f0224a8360.pdfIn PDF document text
    • http://gratoraama.website/power_pressure_cooker_xl_8_qt_partsgulem.pdfIn PDF document text
    • http://100naturals.fun/drastic_ds_emulator_apk_englisheubrg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5ff7e27a86063.pdfIn PDF document text
    • http://reduslim-eu.site/89226776917g4vri.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/tactics_by_gregory_koukl_free_download.pdfIn PDF document text
    • http://prodson.space/finite_mathematics_and_calculus_with_applications_10th_edition_by_lial_greenwell_and_ritchey7ya1g.pdfIn PDF document text
    • http://mavpa.fun/61866893440wknpm.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/gesexix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/85796543-6a10-4520-b7ab-62ac0e0ad9a4/el_coreano_de_corea_minu.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/free_printable_handwriting_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c4205c-3212-409e-b757-8d2eb7a4b742/46491253799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7d6c71-3acd-4301-b9c3-759127d56d41/conair_handheld_steamer_bed_bath_and_beyond.pdfIn PDF document text
    • http://vawirir.atwebpages.com/policy_paradox_the_art_of_political_decision_making_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7b359b-6db1-4f5b-a93e-66ea146e9ada/nifotesovivagoxojelamupov.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/reflection_refraction_diffraction_interference_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/swiffer_wet_jet_wood_floors.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 5232 bytes
SHA-256: 7d924593679fe40f77560d1f4c38f5f51030c29e2084e036cea5b181fde04628
font_01_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 12340 bytes
SHA-256: cb686883247ca5c49ba36962b2ad7b53fa5f2c48e355c2d13b484ec2d7ecab5e
font_02_sfnt_off00013776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13776 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e